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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a14e0b1d52ffd4767878b408710b313bf72e044e5f5f8916816a36b81c1d4b90' 
  AND token = 'NPQKfvu2MEleGghJ0o4TzfvMePvNPG/RqhA7kw33Zmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}